Grant Murdoch was filmed by other snorkelers wrapping his arms around a lemon shark, and hitching a ride underneath - his face only inches from the shark's mouth.
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Despite the swimmer coming out unscathed, a number of fans following Shark Attack News criticized Murdoch - with some calling him "idiotic" and "bloody stupid."
While the Florida Museum of Natural History notes the lemon shark as being a "minimal threat to humans," a Canadian tourist was seriously injured by one earlier this year while scuba diving off Bora Bora, according to The Daily Mail.
Here's the video: